Random Access Channel Hopping for Frequency Division Multiplexing Access Systems

a frequency division multiplexing and access system technology, applied in multiplex communication, wireless communication, wireless communication, etc., can solve the problems of less efficiency, more interference, and inability to decode initial access messages by the network, and achieve the effect of optimizing the operation of the frequency division multiplexing access system

Active Publication Date: 2008-10-30
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such power ramping procedure would create more interference due to unsuccessfully sent messages and it would be less efficient due to the larger delay since it would take much more time to decode the message before an acknowledgement could be given that it was received successfully.
The main characteristics of the RACH is that it is a contention based channel, which means that due to simultaneous access of several users, collisions may occur such that the initial access message cannot be decoded by the network.

Method used

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  • Random Access Channel Hopping for Frequency Division Multiplexing Access Systems
  • Random Access Channel Hopping for Frequency Division Multiplexing Access Systems
  • Random Access Channel Hopping for Frequency Division Multiplexing Access Systems

Examples

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Embodiment Construction

[0083]One aspect of the present invention is the recognition by the present inventor regarding the problems and drawbacks of the related art described above. Based upon such recognition, the features of the present invention have been developed.

[0084]Although the following description will refer to optimized RACH procedures of UMTS merely for the sake of explanation, the features of the present invention are clearly intended to be applicable to various other types of communication methods and systems that would benefit from employing the particular features of the present invention.

[0085]FIG. 11 shows a flow chart of an exemplary control access procedure. It should be noted that the relevant standard related to this matter is 3GPP TS 25.321.

[0086]The control access procedure may be performed in the following five steps:

[0087](1) Existing specifications provide many RACH transmission control parameters which are stored and updated by the UE based on system information broadcasted by ...

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Abstract

A method of coordinating resources for repetition of random access bursts performed by a mobile terminal, the method comprising: determining groups of access slots based on parameters from a network, wherein each access slot is defined by any combination of frequency, time and code, and the access slots are organized according to a frequency pattern; transmitting an access burst on an access slot from a chosen group of access slots; and re-transmitting the access burst on the next access slot from the chosen group of access slots.

Description

TECHNICAL FIELD[0001]The present invention relates to radio communications, and in particular, relates to random access channel hopping for frequency division multiplexing access systems.[0002]2. Background Art[0003]A radio (wireless) communication system may be comprised of an access network and a plurality of access terminals. The access network may include access points, such as Node Bs, base stations, or the like, that allow the access terminals to connect with the access network for uplink (UL: terminal-to-network) communications and downlink (DL: network-to-terminal) communications via various types of channels. The access terminals may be user equipment (UE), mobile stations, or the like.[0004]Although the concepts described hereafter may be applicable to different types of communication systems, the Universal Mobile Telecommunications System (UMTS) will be described merely for exemplary purposes. A typical UMTS has at least one core network (CN) connected with at least one U...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04Q7/00H04W74/08
CPCH04B7/2637H04J13/102H04L5/023H04W74/0866H04W88/02H04W88/08H04B7/204H04J1/08H04W72/04H04W74/08
Inventor VUJCIC, DRAGANFISCHER, PATRICK
Owner LG ELECTRONICS INC
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